I imagine this gets asked a lot but i'm looking for an in depth explanation since none of the others I've found are detailed enough.(adsbygoogle = window.adsbygoogle || []).push({});

I understand that p = mv is not applicable near the speed of light and I think (but am unsure) that the correct equation to use is e = pc.

Assuming that e = pc is the correct equation to use then what does 'p' represent?

Assuming e = pc is the wrong equation then what is the right one?

And can someone (if you can be bothered to waste time on a dumbass like me) explain why p = mv is not applicable?

Thanks.

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# Why do photons have momentum yet no mass?

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